US5690999A - Method and coating device for the coating of a size-press roll, paper or board - Google Patents

Method and coating device for the coating of a size-press roll, paper or board Download PDF

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Publication number
US5690999A
US5690999A US07/944,064 US94406492A US5690999A US 5690999 A US5690999 A US 5690999A US 94406492 A US94406492 A US 94406492A US 5690999 A US5690999 A US 5690999A
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US
United States
Prior art keywords
coating
bar
moving base
coating bar
revolving
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07/944,064
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English (en)
Inventor
Rauno Rantanen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Oy
Original Assignee
Valmet Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valmet Oy filed Critical Valmet Oy
Assigned to VALMET PAPER MACHINERY INC. reassignment VALMET PAPER MACHINERY INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RANTANEN, RAUNO
Assigned to VALMET CORPORATION reassignment VALMET CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). Assignors: VALMET PAPER MACHINERY, INC.
Priority to US08/975,340 priority Critical patent/US6004623A/en
Application granted granted Critical
Publication of US5690999A publication Critical patent/US5690999A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • D21H23/58—Details thereof, e.g. surface characteristics, peripheral speed
    • D21H23/60—Details thereof, e.g. surface characteristics, peripheral speed the material on the applicator roll being subjected to a particular treatment before applying to the paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0813—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for supplying liquid or other fluent material to the roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work

Definitions

  • the invention concerns a method for coating a size-press roll, paper or board or an equivalent moving base.
  • the coating device used in the method comprises a revolving coating bar which rests against the moving base and extends across the machine width.
  • the coating bar is supported in a cradle substantially over its entire length and is fitted to spread and to smooth a coating agent onto the moving base.
  • a coating agent is introduced into the coating device in the running direction of the moving base before the coating bar.
  • the invention is further related to a coating device for coating a size-press roll, paper or board or an equivalent moving base.
  • the coating device comprises a revolving coating bar which rests against the moving base.
  • the coating bar extends across the machine width and is supported substantially over its entire length on a cradle.
  • the coating bar is also fitted to spread and smooth a coating agent onto the moving base.
  • the coating agent has been introduced into the coating device in the running direction of the moving base before the coating bar.
  • a blade coater or a bar coater are commonly used, i.e. a blade coater or a bar coater.
  • the present invention is expressly related to the latter, bar coaters, which have proved excellent especially in the film size press technique.
  • the material of the coating bars currently in use is usually steel, and, in view of increasing the service life of the bar, the bars are provided with chromium plating.
  • bar coaters which have proved excellent especially in the film size press technique.
  • the material of the coating bars currently in use is usually steel, and, in view of increasing the service life of the bar, the bars are provided with chromium plating.
  • surface sizing of paper bars with fully smooth faces have not been used. Rather, the face of the coating bar has been provided with grooves, or alternatively steel wire is wound onto the bar to form a solution similar to grooves on the bar face.
  • a grooved bar is used for the surface sizing of paper because the thickness of the size film to be applied onto the base to be coated is determined by means of the
  • a grooved bar is, however, poorly suitable for the preparation of thin size films, because it is very difficult to manufacture grooves of sufficiently small scale. On the other hand, such small grooves are easily contaminated. It is a further highly significant drawback of grooved bars that they are worn rapidly. Pigmenting with a high dry solids content is also entirely impossible with grooved bars, because the wear of the bars is excessive in this connection.
  • the diameters of the coating bars currently in use have been very small. Small-diameter bars are used because the bar should be able to adapt itself to the shape of the roll face in the size press in order that the profile of the size film could be made suitable and correct.
  • the order of magnitude of the diameter of currently used coating bars is preferably about 10 mm.
  • the bar comprises a small-diameter body on which bushings have been fitted.
  • the bushings are attached to one another in a suitable way as non-revolving.
  • rolls are provided with coatings of particular cross-sectional shapes and, in addition, rolls in a size press in which each of the rolls in the nip is a variable-crown roll.
  • An object of the present invention is to provide a new and improved coating device which avoids the drawbacks of the prior art and by whose means a significant improvement is produced in the pigmenting of paper.
  • a further object is to provide an embodiment with increased technical efficiency over the prior art, notably FI Patent Appl. No. 901967.
  • a loading pressure is applied against a revolving coating bar of a coating device in order to fit the coating bar against a moving base.
  • the coating bar extends in a transverse direction across a width of the moving base and is supported substantially over its entire length by means of a cradle.
  • a coating agent is applied from the coating device onto the moving base before the moving base comes into contact with the coating bar. After the coating agent is applied onto the moving base, the coating bar spreads and smooths the coating agent on the moving base.
  • the loading pressure of the coating bar is regulated in the transverse direction so that the quantity of the coating agent applied onto the moving base is also regulated.
  • a coating device of the short-dwell type is used.
  • a coating agent is introduced into a pressurized coating-agent chamber located in the coating device.
  • the coating agent is then applied from the pressurized coating-agent chamber onto the moving base before the moving base comes into contact with the coating bar.
  • a large-diameter smooth bar is fitted against the moving base and is used as the coating bar.
  • a large-diameter smooth bar is used as a revolving coating bar.
  • the revolving coating bar extends across a moving base in a transverse direction so that the revolving coating bar rests against the moving base.
  • the revolving coating bar is supported by a cradle substantially across its length in the transverse direction.
  • means are provided for applying a coating agent onto the moving base before the revolving coating bar in the running direction of the moving base.
  • the revolving coating bar spreads and smooths the coating agent on the moving base.
  • Regulating means are also provided to regulate the loading pressure of the revolving coating bar and coating quantity of the coating agent in the transverse direction.
  • FIG. 1 is a fully schematic side view of a film size press in which a coating device in accordance with the invention is applied.
  • FIG. 2 is a schematic sectional view of an alternative embodiment of a coating-bar construction in a coating device in accordance with the invention.
  • FIG. 3 is a schematic illustration of an application of the regulation of the profile of the coating bar.
  • FIG. 4 is an additional schematic illustration of an application of the regulation of the profile of the coating bar.
  • FIG. 1 is a schematic illustration of the size press, which is denoted generally with the reference numeral 1.
  • the film size press 1 comprises size press rolls 2 and 3 so that the first roll 2 and the second roll 3 form a nip N between them, the paper or board web W being passed through said nip.
  • a film size F 1 is metered onto the face 4 of the first roll by means of a first coating device 10 and, in a corresponding manner, a second size film F 2 is metered onto the face 5 of the second roll by means of a second coating device 20.
  • the size films F 1 and F 2 are transferred onto the paper or board web W running through the nip.
  • FIG. 1 is a schematic illustration of the size press, which is denoted generally with the reference numeral 1.
  • the film size press 1 comprises size press rolls 2 and 3 so that the first roll 2 and the second roll 3 form a nip N between them, the paper or board web W being passed through said nip.
  • a film size F 1
  • the coated web is denoted with the reference W'.
  • the metering of size films F 1 and F 2 onto faces 4 and 5, respectively, constitutes a premetering step with respect to the metering of the size films F 1 and F 2 onto the board or paper web.
  • the coating devices 10 and 20 by whose means the size films F 1 and F 2 are spread onto the faces 4 and 5 of the rolls 2 and 3 in the size press, are bar coaters, which are substantially equal to one another, as is shown in FIG. 1.
  • the coating devices 10 and 20 are coating devices of so-called short-dwell type, in which the coating agent is introduced into a pressurized coating-agent chamber 16, 26 placed before the coating bar 11, 21.
  • the chamber is also defined by the roll face 4, 5, by the front wall 14, 24 of the coating-agent chamber, as well as by possible lateral seals, if any (not shown).
  • the coating bar 11,21 is fitted in a cradle 12,22 made of a suitable material, for example polyurethane.
  • the cradle 12,22 supports the coating bar 11,21 substantially over its entire length.
  • the coating bar 11,21 is provided with a purposeful drive gear (not shown), by whose means the coating bar 11,21 is rotated in directions opposite to the directions of rotation of the rolls 2,3. Further, in FIG. 1, the holders of the cradles of the coating bars are denoted with the reference numerals 13 and 23, and the holders of the front wall with the reference numerals 15 and 25, Between the coating bar 11,21, cradle 12,22 and the holder 13,23, an ordinary loading hose or equivalent (not shown) is fitted. By means of this loading hose, the coating bar 11,21 can be loaded against the roll face 4,5 to produce the desired loading pressure.
  • a smooth-faced coating bar 11, 21 is employed in the coating devices 10, 20 shown in FIG. 1.
  • the diameter of the coating bar 11, 21 is substantially larger than prior art coating bars.
  • the diameter of the coating bar 11, 21 is at least 18 mm, and, in test runs, very good results have been obtained with a coating device in which the diameter of the coating bar was about 35 mm.
  • FIG. 2 shows an alternative solution, by whose means the regulation of the profile of the coating quantity can be carried out by means of a large-diameter coating bar in accordance with the invention.
  • the size press roll is denoted with the reference numeral 6.
  • the roll 6 is provided with a coating 7 in a conventional manner in which coating 7 may be rubber or an equivalent.
  • the coating bar is denoted with the reference numeral 31 and, in the embodiment shown in FIG. 2, the coating bar 31 comprises a small-diameter body 32.
  • the body 32 of the bar is provided with a suitable outer layer 33, by whose means the diameter of the bar 31 can be made sufficiently large.
  • the outer layer 33 may be formed, e.g., from a tube whose outer diameter is of an order of about 35 mm and the wall thickness about 3 mm.
  • the outer layer 33 may also consist of bushings fitted on the bar body 32, the bushings being attached to one another in a suitable way as non-revolving.
  • the bar 31 as a whole may be formed of a tube of the size mentioned above without a body part.
  • the bar 31 is installed as revolving in cradle 34 made, for example of polyurethane, which cradle 34 is attached to a cradle holder 35. Between the cradle holder 35 and the cradle 34, a loading hose 36 or an equivalent loading member is fitted by whose means the bar 31 can be loaded as desired against the roll 6. In the embodiments shown in FIG. 2, when a small-diameter bar body 32 is used, by means of the loading hose 36, the bar 31 can be profiled in a way corresponding to the prior art small-diameter bars.
  • FIG. 3 shows another embodiment of the invention which provides a manner for adjusting the profile of the coating quantity on the size press rolls to the correct level by means of coating bars in accordance with the invention.
  • the backup roll is denoted by reference numeral 6.
  • the backup roll may be for example a size press roll.
  • Reference numeral 34 denotes a cradle for the coating bar, and reference numeral 36 represents a loading hose that loads the coating bar.
  • the regulating of the profile is carried out by mechanically adjusting the degree of flatness of the loading hose 36 that loads the bar 31, as is illustrated in FIG. 3, by means of the arrows P 1 and P 2 , which represent the forces that load the loading hose 36.
  • the force P 1 is higher than P 2 .
  • the loading linear pressure is higher, because the pressure in the loading hose 36 is applied to a larger area of the loading hose.
  • the profile of linear pressure produced by the bar 31 can also be regulated by means of other techniques, for example, by loading the bar 31 mechanically with different forces at different points.
  • Such an embodiment differs from FIG. 3 in the respect that the forces P 1 and P 2 would act upon the cradle 34 of the bar directly, without a loading hose 36.
  • the effect produced by the loading forces P 1 and P 2 on the profile of coating quantity is that, at the higher loading force P 1 , the linear pressure is higher, whereby, correspondingly, at this point, the thickness D 1 of the coating layer is smaller. In a corresponding way, a lower loading force P 2 provides a thicker coating layer D 2 .
  • the forces P 1 and P 2 can be produced by mechanical power units 39, 40, respectively.
  • the coating bar 31 can be loaded with forces of different magnitudes at different points and also the extent of flatness of the loading hose 36 can be adjusted.
  • a coating bar 31 having a diameter of about 35 mm is quite rigid. Even minor changes in the deflection of the coating bar will have a clear effect on the coating quantity, because the thickness of the size of pigment coating is very little.
  • the thickness of the coating layer is of an order of from about 4 ⁇ m to about 20 ⁇ m.
  • a good result in respect of the profiling can be achieved by using roll coatings whose hardness is about 30 P&J to about 40 P&J.

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  • Coating Apparatus (AREA)
  • Paper (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
US07/944,064 1991-09-16 1992-09-11 Method and coating device for the coating of a size-press roll, paper or board Expired - Lifetime US5690999A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US08/975,340 US6004623A (en) 1991-09-16 1997-11-20 Method and device for coating a size-press roll or paper or board web

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI914327A FI91299C (fi) 1991-09-16 1991-09-16 Menetelmä ja päällystyslaite liimapuristimen telan, paperin tai kartongin päällystämiseksi
FI914327 1991-09-16

Related Child Applications (1)

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US08/975,340 Continuation US6004623A (en) 1991-09-16 1997-11-20 Method and device for coating a size-press roll or paper or board web

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US5690999A true US5690999A (en) 1997-11-25

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US07/944,064 Expired - Lifetime US5690999A (en) 1991-09-16 1992-09-11 Method and coating device for the coating of a size-press roll, paper or board

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US (1) US5690999A (fi)
EP (1) EP0533643A1 (fi)
JP (1) JP3173888B2 (fi)
CA (1) CA2078320C (fi)
FI (1) FI91299C (fi)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5756156A (en) * 1995-02-01 1998-05-26 Valmet Corporation Method for producing surface-treated paper and dry end of a paper machine
US6004623A (en) * 1991-09-16 1999-12-21 Rantanen; Rauno Method and device for coating a size-press roll or paper or board web
US6126787A (en) * 1995-02-01 2000-10-03 Valmet Corporation Dry end of a paper machine
US6280576B1 (en) * 1996-07-31 2001-08-28 Valmet Corporation After-dryer in a paper machine
US6291017B1 (en) * 1996-03-06 2001-09-18 Valmet Corporation Method for coating a moving web with at least two coat layers
US6514571B1 (en) 1998-05-21 2003-02-04 Eastman Kodak Company Method and apparatus for applying a solution to photosensitive material
US20160038969A1 (en) * 2013-04-05 2016-02-11 Voith Patent Gmbh Film press
CN114197244A (zh) * 2020-09-02 2022-03-18 维美德技术有限公司 施胶机

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4414949A1 (de) * 1994-04-28 1995-11-02 Voith Gmbh J M Vorrichtung zum Auftragen von mindestens einem flüssigen Medium auf eine laufende Materialbahn
US5599393A (en) * 1995-04-25 1997-02-04 Macmillan Bloedel Limited Metering rod coaters
EP0757129B1 (de) * 1995-07-29 2001-12-05 Jagenberg Papiertechnik GmbH Auftragsystem für eine Vorrichtung zum Beschichten einer Papier- oder Kartonbahn
US6316060B1 (en) 1996-08-20 2001-11-13 Pacifica Papers Inc. Metering coatings

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2676563A (en) * 1949-02-05 1954-04-27 Champion Paper & Fibre Co Apparatus for coating paper
US4839201A (en) * 1987-12-03 1989-06-13 Valmet Paper Machinery Inc. Method and apparatus for applying coating liquid to a moving base
US4981726A (en) * 1987-08-04 1991-01-01 Valmet Paper Machinery Inc. Method and apparatus for dispensing coating materials on a moving substrate with a smoothing member and supporting structure

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2970564A (en) * 1955-12-23 1961-02-07 Champion Paper & Fibre Co Apparatus for coating paper
DE3703834A1 (de) * 1987-02-07 1988-08-18 Jagenberg Ag Rollschaberauftragwerk zum auftragen von beschichtungen auf materialbahnen
FI88421C (fi) * 1990-04-19 1993-05-10 Valmet Paper Machinery Inc Bestrykningsanordning foer bestrykning av vals i en limpress, papper eller kartong

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2676563A (en) * 1949-02-05 1954-04-27 Champion Paper & Fibre Co Apparatus for coating paper
US4981726A (en) * 1987-08-04 1991-01-01 Valmet Paper Machinery Inc. Method and apparatus for dispensing coating materials on a moving substrate with a smoothing member and supporting structure
US4839201A (en) * 1987-12-03 1989-06-13 Valmet Paper Machinery Inc. Method and apparatus for applying coating liquid to a moving base

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6004623A (en) * 1991-09-16 1999-12-21 Rantanen; Rauno Method and device for coating a size-press roll or paper or board web
US5756156A (en) * 1995-02-01 1998-05-26 Valmet Corporation Method for producing surface-treated paper and dry end of a paper machine
US6126787A (en) * 1995-02-01 2000-10-03 Valmet Corporation Dry end of a paper machine
US6193840B1 (en) 1995-02-01 2001-02-27 Valmet Corporation Method for producing surface-treated paper
US6291017B1 (en) * 1996-03-06 2001-09-18 Valmet Corporation Method for coating a moving web with at least two coat layers
US6346148B1 (en) 1996-03-06 2002-02-12 Valmet Corporation Apparatus for coating a moving web with at least two coat layers
US6280576B1 (en) * 1996-07-31 2001-08-28 Valmet Corporation After-dryer in a paper machine
US6514571B1 (en) 1998-05-21 2003-02-04 Eastman Kodak Company Method and apparatus for applying a solution to photosensitive material
US20160038969A1 (en) * 2013-04-05 2016-02-11 Voith Patent Gmbh Film press
CN114197244A (zh) * 2020-09-02 2022-03-18 维美德技术有限公司 施胶机
CN114197244B (zh) * 2020-09-02 2024-01-16 维美德技术有限公司 施胶机

Also Published As

Publication number Publication date
JPH06316896A (ja) 1994-11-15
FI914327A (fi) 1993-03-17
CA2078320A1 (en) 1993-03-17
EP0533643A1 (en) 1993-03-24
FI91299C (fi) 1994-06-10
CA2078320C (en) 2000-12-05
FI914327A0 (fi) 1991-09-16
FI91299B (fi) 1994-02-28
JP3173888B2 (ja) 2001-06-04

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